I'm really confused at the moment and would quite appreciate some guidance. I've got little to no background in Matlab and am needing to plot a simple pendulum. I have found the equation of motion which is q(doubledot) = -(g/l)sin(beta) I don't know how to go about this? After declaring the variables: runtime = 50; %duration of simulation in seconds g = 9.8; startingangle = 20; %starting angle in degrees initialvelocity = 0; length = 1; How do I go about this? Does anyone have any good tutorials to help me out? I know I need to incorporate some function called ode45..